Steam-generator.



No. 665,062. Patented Ian. l, 190:.

- T. YCASCADEN, m.

STEAM GENERATOR.

(Application flledfdune I 7, 1900. (No ModpL) 2 Shanty-Shed" l,

. :T Z M m: mums [ms-s co.. PHOTO-CITHO..,WANQIEGION, o. c.

No; 665.062 Pafented Ian.. I, 190}.

T. CASCADEN,-ln.

STEAM GENERATOR.

(Application flledvid'uno 7. 190m? I (No Model.) '2 Sheets-Shut 1-UNITED STATES PATENT OFFICE.

THOMAS OASOADEN, JR., OF WATERLOO, IOWA, ASSIGNOR TO THE DAVIS GASOLINEENGINE WORKS COMPANY, OF SAME PLACE.

STEAMf'GENERAT OR.

SPECIFICATION forming part of Letters Patent No. 665,062, dated January1, 1901.

Application filed June 7, 1900.

To all whom it may concern.-

Be it known that I, THOMAS CASCADEN, J r., a resident of Waterloo, inthe county of Black Hawk and State of Iowa, have invented certain newand usefulImprovements in Steam-- Generators, of which the following isa full, clear, and exact description.

This invention has relation more particularly to that class ofsteam-generators more particularly adapted forthe steaming and cookingof food for cattle, or like situations, where the generation of the lowpressure of steam is desired. Manifestly, however, the improvementshereinafter described may be employed in other types of steam-generatorswithout departing from the spirit of the invention.

In the construction of low-pressure steamgenerat-ors such as arecommonly used for the steaming and cooking of cattlefood it is desirablein order to meet the demands of the trade, that the construction of thegenerator shall be as simple and cheap as is consistent with safety. Themost common of this type of steam-generators is that form in which thebody of the generator is of oval shape, the lower part, which comprisesthe fire-box, being separated by a simple crown-sheet from the upperpart, that comprises the boiler, and the charging-door of the fire-boxbeing at the front of the generator and the smoke-stack at the rear.

The main object of this invention is to provide a far more effectivesteam-generator at a comparatively slight increase in cost; and thisobject I have accomplished, first, by the improvement in theconstruction of the generator so that the water-spaces shall extend ateach side of the fire-box, and, second, by providing a water-pan that islocated in the fire-box and is in communication with the mainwater-chamber of the generator, this pan being preferably so disposed asto cause the products of combustion to travel to the back of thefire-box and to be then returned to the front, at which point thesmoke-stack is located.

Referring to the accompanying drawings, Figure l is a View in elevationof the steamgenerator with parts broken away and parts in cross-section.Fig. 2 is a view in cross- $erial No. 19A62, KNomodel.)

erably formed of plate-steel, (fourteen gage being a suitablethickness,) comprises the outer casing A, the inner casing B, the backplate 0, and the front plate D. The outer shell or casing-A is united tothe inner shell or casing B by suitable bolts E, and these bolts at therear end of the generator also pass through the outwardly-turned flangesc of the front and back plates. By preference, also, reinforce-straps Fextend around the front, rear, and sides of the gen'erator,.and throughthese straps the bolts E alsopass. By reference to Figs. 1 and 2 of thedrawings it will be seen that the inner casing B, the upper part ofwhich constitutes the crownsheet of the generator, is extended down tothe bottom of the generatorand forms with the outer casing adownwardly-narrowing chamber at each side of the fire-box H. The spacebetween the inner and outer casings A and B constitutes thewater-chamber, and hence it will be seen that a thin sheet of water isexposed to the action of the heat at each side of the fire-box. By thusforming the sides of the generator with double walls I a much moreextended area of water-surface is exposed to the action of the productsof combustion, so that the effective heat of the fuel is more fullyattained. Theinterior of the casing B, which comprises the fire-box andcombustion-chamber of the'generator, is provided in its front portionwith suitable grate-bars J, upon which the fuel will be laid. Within thecombustionchamber, and preferably in the location shown in the drawings,is placed a water-pan that serves a twofold function first, to cause theproducts of combustion to pass in rearward and then in forward directionuntil they escape by the smoke-stack S, that is located at the top ofthe front of the fire-box, and, second, to expose a large thin body ofwater to the action of the products of combustion within the fire-box.shown, this water-pan consists of a cast-metal body M, having a flangem, to which is connected by boltsN the bottom plate 0. Profholestherethrough being drilled coincident* strap F, similar 'to strap F, isplaced be-j' tween the edges of plate 0 and the nuts on bolts N.Preferably, also, the water-pan is of substantially the full width ofthe fire-box and is connected at its inner end to the casing B by shortthreaded coupling-pipes P,that enter threaded holes in the sides of thepan M and also enter corresponding holes in the side Walls of the casingB, suitable retainingnutsp being'employed upon the outer'ends of thecoupling-pipes P to securely clamp the side wall of the casing B to thewater-pan M. 1 The upper end of the water-pan is preferably 1 connectedto the top or crown-sheetiof the casing B by a short pipe R, the lowerthreaded end of which is united to the top of i the waterpan by suitablethreaded nuts 1', 4 while the upper end of this .pipe R lSCOH"; nectedto the crown-sheet of the casingB by corresponding threaded nuts r,arranged,

upon oppositesides of the crown-sheet. If 1 desired, also, boltst may bepassed through 5 the front wall D of the heater and into the end of thewater-pan M. It willibe understood, of course, that the front of theheater Willbe provided with the usual charging-door, whereby fuel willbe admitted to the fire-box, 7 and the rear of the generatorwill befurnished with pump and gage-cocks as desired, and y the top of thegenerator will be provided with i the usual dome and steam-supply pipeleading therefrom.

From the foregoing description it will be seen that in asteam-generatoreinbodying my improvements not only is a very much larger surface ofwater exposed to the action of the heat within the fire-box by reason ofthe dou- 1 ble walls at the sides thereof, but inasmuch as the productsof combustion are caused to be returned to the front of thegenerator be-1 fore their escape to the smoke-stack a much more effective utilizationof the heat is attained. Moreover, as the products of CQIIP, bustionpass around the water-pan located above the fire-box the thin sheet ofwater 1 Within this pan is exposed to a high temperature, and byreasonof its communication with the body of water above the crown-sheetof the boiler the heating of the water and the rapid generation of steamare efiectively accomplished.

By reference to Fig. 1 of the drawings it will be seen that thewater-pan is inclined downwardly from the front toward the rear, thepurpose of this arrangement being not only to allowcirculationof waterthrough the pan and the draining of the same, but also to cause the moreeffective action of the products of combustion upon the pan as theytravel toward the back and are returned to the front of thecombustion-chamber. In order to enable the water-chamber to beefiectively drained, suitable holes to will be provided at the rear ofthe water-chamber adjacent its bottom, these holes being normally closedby suitable plugs.

It .is-manifest that the precise detailsiof construction above set outmay be varied without departing from the spirit of the invention.

Having thus described my invention, what I claim as new, and desiretosecure .by Letters Patent, is

In an internally-firedsteam-boiler,the combination with inner and outershells forming an internal-combustion chamber, a waterspace andwater-legs on either side of the combustion-chamber directly connectedwith the water-space, of a fire-box and smoke-stack at the forward endof the combustion-chamber, a water-pan having a closing-plate boltedthereto arranged in the internal-combustion chamber between the fire-boxand smoke stack and preventing direct communication between the two,said water-pan extending from the forward end of the combustionchamberand downwardly inclined toward the rear end, threaded nipples connectingthe lower rear end of said Water-pan and the inner shell and openinginto andforming communications between said water-pan and the water-legson either side of the combustionchamber, and a threadedpipe connectingthe upper, front end of the water-pan and the upper part of the innershell or crown-sheet, lock-nuts on said pipe and said nipples on eitherside of the inner shell, whereby a return draft under and over thewater-panand a ready circulation of the water through the pan areproduced.

THOMAS .CASOADEN, JR. Witnesses:

IRA RODAMAR, EMMA RODAMAR.

